OEX Alternator 12V 80A Mitsubishi Style MXA399

The OEX MXA399 is a new 12V, 80A alternator in Mitsubishi style, supplied as an each unit for rotating electrical applications. It uses a twin leg alternator mount, with 40mm inside mounting legs and an M8x1.25 pivot hole diameter, so the physical mounting points need to be checked against the vehicle before purchase.

This alternator is fitted with an internal regulator, a 5 groove pulley, and a 65mm pulley outside diameter. Those details matter when matching the unit to the vehicle drive system, belt profile, and charging setup, especially where the original alternator is being replaced rather than the full charging system.

OEX identifies this unit under part number MXA399 and notes it as a Mitsubishi suit unit. The listing also carries the instruction to confirm by OE number, which is the safest way to narrow down compatibility when a vehicle may have more than one alternator option.

For buyers needing a replacement alternator with clear electrical and mounting data, the important checks here are voltage, amperage, regulator type, pulley configuration, and mount dimensions. The unit weighs 4.5kg and has a mount centre to centre measurement of 165mm, all of which can help with comparison against the removed part.

Key Features

• 12V alternator with 80A output
• New unit, not remanufactured
• Internal regulator
• Twin leg alternator mount
• 5 groove pulley
• Mitsubishi style application

Specifications

• Brand: OEX
• Product type: Alternator
• Part No.: MXA399
• Voltage: 12V
• Power rating: 80A
• Regulator type: Internal
• Alternator mount: Twin leg
• Inside mounting legs: 40mm

Fitment guidance

• Verify compatibility by OE number before ordering.
• Check the alternator mount type is twin leg.
• Confirm the inside mounting legs measure 40mm.
• Confirm the pivot hole is M8x1.25 / 8.
• Check the adjusting hole diameter is M8x1.25.
• Confirm the pulley is 5 groove with a 65mm outside diameter.
• Compare the mount centre to centre measurement of 165mm against the removed unit.
• This unit is listed as Mitsubishi style and suits Mitsubishi applications.

Application and Buying Notes

The most reliable way to assess this alternator is to compare the part number MXA399, the Mitsubishi style designation, and the OE number from the vehicle or the removed unit. The listing advises confirmation by OE number, and that is important because alternators can vary even within the same model range.

The mounting and pulley details are just as important as the electrical rating. This unit is 12V and 80A, with an internal regulator, twin leg mount, 40mm inside mounting legs, a 165mm mount centre to centre measurement, and a 5 groove pulley with a 65mm outside diameter. If any of those do not match, the unit may not physically install or may not suit the belt arrangement.

The alternator is supplied new and backed by a 3yr Passenger / 1yr Commercial warranty. That warranty period can be useful, but it does not replace the need to verify fitment. Always check the vehicle application, the OE number, and the measured mounting points before finalising the purchase.

If you are replacing a failed alternator, compare the old unit carefully against this one before installation. The pivot hole diameter is M8x1.25 / 8 and the adjusting hole diameter is M8x1.25, so even small differences in bracket design can affect fit. Matching the pulley section and diameter is also essential to keep the belt system aligned correctly.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number MXA399 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR, Unit of Measure EACH, Warranty 3yr Passenger 1yr Commercial, Inside Mounting Legs 40mm, Pivot Hole Diameter M8x1.25 / 8, Pulley Outside Diameter 65mm, Regulator Type Internal, Voltage 12, Alternator Mount Twin Leg, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. MXA399, Brand OEX, Description OEX Alternator 12V 80A Mitsubishi Style, Adjusting Hole Diameter M8x1.25, Pin Code IR43, Power Rating (Amp) 80, Pulley Section 5 Groove, Suits Unit Make Mitsubishi.

OEX Alternator 12V 80A Mitsubishi Style. Part number MXA399 should be checked first. Listed voltage is 12. Listed output rating is 80. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Twin Leg. Regulator type is Internal. Pulley configuration is 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number MXA399, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 80 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment using the OE number, part number MXA399, and the listed mounting and pulley measurements before ordering. Do not rely on style description alone; check the vehicle’s alternator mount, belt groove count, and hole sizes against the removed unit.

FAQ

What is the part number for this alternator?

The part number is MXA399.

Is this alternator new or remanufactured?

It is listed as new.

What is the electrical output?

It is a 12V alternator with an 80A power rating.

What type of regulator does it have?

It has an internal regulator.

What mounting details should I check before buying?

Check the twin leg mount, 40mm inside mounting legs, M8x1.25 / 8 pivot hole, M8x1.25 adjusting hole, and the 165mm mount centre to centre measurement.

What vehicles is it listed for?

It is listed as Mitsubishi style and suits Mitsubishi applications. The listing also advises confirming by OE number before purchase.